Linux beginners, some practical commands

Linux beginners, some practical commands cd ~ Enter the root directory cd/enter the root directory makecleanmake error, clear rm-rf * delete all folders rm-rf *. * delete all files (rpm & amp; ndash; qa | greppcre) and check whether the pcre package is installed... linux beginners, some practical commands cd ~ Enter the root directory cd/enter the root directory make clean make error, clear rm-rf * delete all folders rm-rf *. * delete all files: rpm-qa | grep pcre check whether the pcre package netstat-apn has been installed | grep 7979 check the process of port 7979 kill 30240 to close the process. /host. sh run the tail-f cups file. log Query log chmod 744 monitor. sh grants the file operation permission su-root to switch user service network restart to restart the network service. service iptables status view firewall status service iptables stop close fire wall installation pcre error: warning: pcre-devel-6.6-6.el5_6.1.i386.rpm: Header V3 DSA signature: NOKEY, key ID e8562897 error: Failed dependencies: pcre = 6.6-6. el5_6.1 is needed by pcre-devel-6.6-6.el5_6.1.i386 solution: rpm-ivh db4-tcl-4.3.29-10.el5.i386.rpm -- force -- nodeps the following figure shows that the installation is successful Loaded plugins: rhnplugin, security This system is not registered with RHN. RHN support will be disabled. setting up Install Process Nothing to do